Myths vs facts: FT3 and allergy

The question of myths vs facts regarding FT3 (free triiodothyronine) and allergies is not addressed in the provided context. FT3 is a thyroid hormone regulating metabolism, but it is not directly involved in allergic reactions. There is no strong evidence from the given knowledge base that FT3 levels cause or treat allergies. Some mechanistic studies suggest thyroid hormones have immunomodulatory effects, but clinical relevance is lacking. Myths such as 'low FT3 causes allergies' or 'FT3 supplementation cures allergies' are not supported by solid data. Facts: Allergies are complex immune responses mediated by IgE, histamine, and cytokines. Thyroid hormones may indirectly influence the immune system, but a causal link is unproven. If thyroid dysfunction is suspected, consult a physician; do not self-supplement. Evidence grade: unclear, as no specific sources are available.